set PGUSER=postgres
set PGPASSWORD=xxx
set OUTPUTPATH=e:\myfile.backup
set DB=whatever
set HOST=whatever

pg_dump -h %HOST% -p 5432 -U %PGUSER% -F c -b -v -f %OUTPUTPATH% %DB%

rem TCP port to unblock is 5432
echo "host all all 0.0.0.0/0 md5" >> /etc/postgresql/9.3/main/pg_hba.conf
reload service